Anatomy and Cell Biology 3319 Lecture : Anatomy Notes

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Movements of the arm at the shoulder joint: flexion (moving arm forward), extension (moving arm backward), adduction, abduction, medial rotation, lateral rotation, circumduction (circular movement around shoulder). 9 muscles cross the shoulder joint and move the arm: 2 posterior muscles latissimus dorsi and teres major, 2 anterior muscles pectoralis major and coracobrachialis, the deltoid muscle, and the 4 rotator cuff muscles. Pectoralis major (anterior muscle): is a large, fan-shaped muscle covering the upper portion of the chest and it is divided into clavicular and sternal parts. O clavicular head: anterior surface of medial. Of clavicle, sternocostal head: anterior surface of sternum, superior 6 costal cartilages, aponeurosis of external oblique muscle. I lateral lip of intertubercular groove of humerus (greater tubercle). Action flexion (prime mover), adduction, medial rotation of arm/shoulder. Innervation lateral and medial pectoral nerves (c5-c8, t1). Coracobrachialis (anterior muscle): is a small cylindrical muscle. O tip of coracoid process of scapula.

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